Hanna Instruments HI 98170 - Manual (Page 33)

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CHR xx Change the instrument range according with the parameter
value (xx):
• xx=01 pH range/0.01 resolution
• xx=02 pH range/0.1 resolution (HI 98170, HI 98171)
• xx=03 mV range
• xx=04 Relative mV range
• xx=05 ISE range (HI 98172)
The instrument will answer for these commands with:
<STX> <answer > <ETX>
where: <STX> is 02 ASCII code character (start of text)
<ETX> is 03 ASCII code character (end of text)
<answer>:
<ACK> is 06 ASCII code character (recognized command)
<NAK> is 21 ASCII code character (unrecognized command)
<CAN> is 24 ASCII code character (corrupted command)
COMMANDS REQUIRING AN ANSWER
The instrument will answer for these commands with:
<STX> <answer> <checksum> <ETX>
where the checksum is the bytes sum of the answer string sent as 2 ASCII characters.
All the answer messages are with ASCII characters.
RAS
Causes the instrument to send a complete set of readings in
according with the current range:
• pH and temperature reading (HI 98170), and mV
reading (HI 98171) on pH range.
• Rel mV, absolute mV and temperature reading on Rel
mV range (HI 98171, HI 98172).
• ppm, mV and temperature reading on ppm range
(HI 98172).
The answer string contains:
• Meter mode (2 chars):
• 01 - pH range (0.01 resolution)
• 02 - pH range (0.1 resolution)
• 03 - mV range
• 04 - Rel mV range
• 05 - ISE range
• Meter status (2 chars of status byte): represents a 8 bit
hexadecimal encoding.